workingctx: factor out post-status dirstate fixup

We want to allow extensions to be able to add code to run inside the wlock.

mercurial/context.py

@@ -1738,7 +1738,10 b' class workingctx(committablectx):'
                 # it's in the dirstate.
                 deleted.append(f)
 
-        # update dirstate for files that are actually clean
+        return modified, deleted, fixup
+
+    def _poststatusfixup(self, fixup):
+        """update dirstate for files that are actually clean"""
         if fixup:
             try:
                 oldid = self._repo.dirstate.identity()
@@ -1767,7 +1770,6 b' class workingctx(committablectx):'
                                             'identity mismatch\n')
             except error.LockError:
                 pass
-        return modified, deleted, fixup
 
     def _dirstatestatus(self, match=None, ignored=False, clean=False,
                         unknown=False):
@@ -1781,15 +1783,17 b' class workingctx(committablectx):'
                                             listclean, listunknown)
 
         # check for any possibly clean files
+        fixup = []
         if cmp:
             modified2, deleted2, fixup = self._checklookup(cmp)
             s.modified.extend(modified2)
             s.deleted.extend(deleted2)
 
-            # update dirstate for files that are actually clean
             if fixup and listclean:
                 s.clean.extend(fixup)
 
+        self._poststatusfixup(fixup)
+
         if match.always():
             # cache for performance
             if s.unknown or s.ignored or s.clean:

tests/fakedirstatewritetime.py

@@ -2,7 +2,7 b''
 # specified by '[fakedirstatewritetime] fakenow', only when
 # 'dirstate.write()' is invoked via functions below:
 #
-#   - 'workingctx._checklookup()' (= 'repo.status()')
+#   - 'workingctx._poststatusfixup()' (= 'repo.status()')
 #   - 'committablectx.markcommitted()'
 
 from __future__ import absolute_import
@@ -55,16 +55,16 b' def fakewrite(ui, func):'
         parsers.pack_dirstate = orig_pack_dirstate
         dirstate._getfsnow = orig_dirstate_getfsnow
 
-def _checklookup(orig, workingctx, files):
+def _poststatusfixup(orig, workingctx, fixup):
     ui = workingctx.repo().ui
-    return fakewrite(ui, lambda : orig(workingctx, files))
+    return fakewrite(ui, lambda : orig(workingctx, fixup))
 
 def markcommitted(orig, committablectx, node):
     ui = committablectx.repo().ui
     return fakewrite(ui, lambda : orig(committablectx, node))
 
 def extsetup(ui):
-    extensions.wrapfunction(context.workingctx, '_checklookup',
-                            _checklookup)
+    extensions.wrapfunction(context.workingctx, '_poststatusfixup',
+                            _poststatusfixup)
     extensions.wrapfunction(context.committablectx, 'markcommitted',
                             markcommitted)

tests/test-dirstate-race.t

@@ -101,7 +101,7 b' anyway.'
 
 Test that dirstate changes aren't written out at the end of "hg
 status", if .hg/dirstate is already changed simultaneously before
-acquisition of wlock in workingctx._checklookup().
+acquisition of wlock in workingctx._poststatusfixup().
 
 This avoidance is important to keep consistency of dirstate in race
 condition (see issue5584 for detail).